Mechanism for operating drills



(No Model.) v 2 SheetsSheet l.

y W. THIEM. MEGHANISM FOR OPERATING DRILLS. No. 389,613. Patented Sept.18, 1888.

' W II'NESSESI INVENTQR (No Model.) I 2 Sheets-Sheet 2.

W. THIEM.

MECHANISM FOR OPERATING DRILLS.

N0. 389,613, Patented Sept. 18, 1888.

M JV

INVENTOR Ziorney.

UNITED STATES- PATENT OFFICE.

WILHELM THIEM, OF BELLEVUE, KENTUCKY.

MECHANISM FOR OPERATING DRILLS.

SPECIFICATION forming part of Letters Patent No. 389,613, datedSeptember 18, 1888.

Application filed Februaryfl, 1888. Serial No. 262,765. (No model.)

To (ZZZ whom it may concern.-

Be it known that I, WILHELM THIEM, of Bellevue, in the county ofCampbell and State of Kentucky, have invented a new and usefulImprovement in Mechanism for Operating Drills, which improvement isfully set forth in the following specification and accompanyingdrawings, in which Figure l is a front view ofmy mechanism for operatingdrills. Fig. 2 is an edge View of thesame; Figs. 3 and 4, verticalsectional views of the holder for manipulating the drills, and Fig. 5detail perspective view of the lower portion of the frame.

The object of my invention is to construct a mechanism for operatingdrills by hand and it consists of a vertical frame having centrally ahorizontal cross-bar, to which bar and the cross-beam above isjournaleda vertical twistbar, the lower end of which has a socket forattaching thereto a bit, and the upper end of which is provided with abalance-wheel or arms. This twist-bar carries a tubular sliding pieceprovided with hinged pawls, and over this tube is a sliding holdertubular in form, so that when the hand grasps the sliding holder andpresses it downward it will slide to the lower end of the tubular pieceand cause the pawls to engage with the twisted grooves of the bar androtate the same. Two weights at tached, respectively, to the tubularpiece and to the slidingholder serve to raise these parts when thedownward pressure is released. The lower halfof the frame is providedwith avertically-sliding frame, on which the material to be drilled isplaced, and this frame is counterbalanced by suitable weights.

In the accompanying drawings, A represents a pair of posts parallel witheach other mounted on a suitable base, B, and secured to a similar pairof posts by means of the top beam, 0, and central cross-bar, D. Theposts thus form guideways on each side, between which thecounter-balancing weights are placed, as will be hereinafter shown.

' Eis avertical shaft journaled to the beams G D midway between theposts A A. The upper end of this shaft is provided with a balancewheelor weighted arms,F, and at its lower end a head, G, provided with asocket to receive a bit, H, and a thumb-screw, G, on one side fortightening the bit. The shaft is further provided with a collar, I,ashort distance above the journal in the beam 0, anda lever, J,fulcrumed to the beam 0, has one end placed under this collar, theopposite end being constructed so that it projects slightly beyond thebeam 0. The shaft E being capable of a limited vertical motion the leverJ is employed to raise it when desired in the operation of boring.

The shaft E is constructed with a twist, or, preferably, with twistedgrooves K,on opposite sides. The construction shown in the ord narytwist-bit will answer for this purpose satisfactorily.

In Figs. 3 and 4 I show vertical sectional views of a tubular piece, L.This is made of suitable size to fit loosely on the twisted shaft E. Oneach side it is provided with a slot, M, to which slots are pivotedcentrally levers N, Which are slightly curved, the lower ends havinginwardly-turned pawls or teeth 0. The lower end of the tubular piece Lhas a lug or stop, 1?. This tubular piece is designed toreceivethet11bularholderQ,whiehslidesthereon. The upper end of thetubular holder Q has at one side a lug or pin, R, while thenpper end ofthe tubular piece L on the opposite side has a similar pin, R, to whichthe weighted ropes are respectively attached. In the beam 0,011 one sideof the shaft E, are two grooved pulleys, S S, one of them being directlyabove and in line with the pin R on the tubular holder Q, and the otherin line with the weight U, between the posts A. A rope, T, attached tothe tubular holder Q, passes over these grooved pulleys S S, and thencedown to the weight U. In like manner grooved pulleys S S are located inthe beam 0 on the other side of the bar E, and a rope, T, attached tothe tubular piece L, passes over these pulleys and thence down to theweight U.

The lower half of the frame, or that portlon below the central beam, D,is provided with a vertically-movable frame or table, the vertical sidelimbs, V, of which are properly gained, so they will slide between theparallel posts A. These vertical pieces are joined at the r upper andlower ends by means of cross-pieces or tables W, which tables areprovided centrally with apertures TV, through which the bit H can pass.Each vertical limbVhas on its side an eccentric or cam lever, X, whichin operation binds against the post A.

The object of this is to hold the sliding frame in any position desired.

Y Yare grooved pulleys located directly below the central beam, D,between the posts A and Z Z, weights which slide between the posts A.

Z Z are ropes attached to the frame and weights in order tocounterbalance the frame and elevate it.

The operation is as follows: The bit H being adjusted, the article to bedrilled or bored is placed on the table \V of the sliding frame. If thebit is a short one, the upper table can be used. Ifalong bit isemployed, thelower table can be used. The weights Z are preferablyheavier than the table, so as to elevate both the table and the articleto be bored, which may be placed thereon. The operator then grasps thetubular holder Q and forces it downward with a rapid motion, causing itto slide down on the tubular piece L until it reaches the stop P, asshown in Fig. 4, and then both tubular pieces are moved downward on thetwisted rod E. The noses or pawls O of the levers N are forced into thegrooves of the rod E, and thereby cause the latter to rotate. When thesetubular pieces have reached their lowest limit, they are drawn backsuddenly, and the effect of the initial motion is to return the tubu- 0lar holder Q to its original position, as shown in Fig. 3, thusdisengaging the pawls O. The balance-wheel or weighted arms F in themean time continue the motionof the rod E. The operation of thetubularholder is then repeated, 5 the weights U U being utilized to drawup the tubular holders after each downward motion.

\Vhat I claim as new is 1. In mechanism for operating drills, a framehaving therein a vertical rotatable twist-shaft provided with abalance-wheel or arms at its 0 upper end and a bit-socket at its lowerend, in combination with a tubular piece and a tubular holder slidingthereon having pawls for engaging with the twist shaft or rod, andsuitable ropes and weight for elevating said tubular holders,substantially as herein set forth.

2. In mechanism for operating drills, a vertical twist shaft or rod forcarrying the bit, having thereon a sliding tubular piece provided withcentrally-hinged levers in the sides, provided with inwardly-projectingpawls on their lower ends, in combination with a thimble or slidingholder on said tubular piece, which moves to and fro thereon forengaging and disengaging the pawls with the twist-shaft, substantiallyas herein set forth.

3. The vertically-journaled twist-shaft for carrying the bit, havingthereon a sliding tubular piece provided with rocking levers and pawls,and the thimble or holder thereon for operating said levers, incombination with a rope and weight connected with the tubular piece, andan independent rope and weight connected with the thimble, substantiallyas herein set forth.

4. In mechanism for operating drills, a frame having journaled in theupper part a vertical bit'shaft, in combination with a verticallyslidingframe carrying two tables in thelower part of the frame, andcounterbalancingweights, substantially as herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this1st day of October, 1887, in the presence of witnesses.

\VILHELM THIEM.

Vitnesses:

Roar. S. MILLAR, CHRIST GARDOUX.

